User terminal device and displaying method thereof

ABSTRACT

A user terminal device and a displaying method thereof are provided. The user terminal device includes a display configured to display a first screen on a display which is divided by a folding line into a first area and a second area, the second area being larger than the first area with reference to a folding line and including an exposure area that is exposed while the display is folded along the folding line such that the first area faces the second area, a detector configured to detect, while the first screen is displayed, a first folding interaction of folding the display such that the first area faces the second area and a second folding interaction of folding the display such that a first cover corresponding to the first area faces a second cover corresponding to the second area, and a controller configured to, in response to detecting the first folding interaction, display a second screen related to the first screen on the exposure area, and in response to the second folding interaction being detected, display a third screen related to the first screen on the first area or the second area.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from Korean Patent Application No.10-2014-0083244, filed in the Korean Intellectual Property Office onJul. 3, 2014, and the benefit of U.S. Provisional Application No.61/937,744, filed in the United States Patent and Trademark Office onFeb. 10, 2014, the disclosures of which are incorporated herein byreference in their entireties.

BACKGROUND

1. Field

Apparatuses and methods consistent with exemplary embodiments relate toa user terminal device and a displaying method thereof, and moreparticularly, to a user terminal device where a display is foldedasymmetrically with reference to a folding line so as to expose a partof the display and a displaying method thereof.

2. Description of Related Art

With the development of electronic technology, various types of userterminal devices have been developed and distributed. Recently, the sizeof such user terminal devices has been minimized while the functions ofthe devices have become diverse and thus, the demands for user terminaldevices have been increasing continuously.

A user terminal device may provide various content such as multimediacontent and application screens according to a user's request. A usermay select a desired function using a button or a touch screen providedwith a user terminal device. A user terminal device may execute aprogram selectively according to a user interaction and display theresult of execution.

Meanwhile, as a user terminal device provides far more diversefunctions, there are various needs for a method of displaying content ora user interface method. In other words, as the method of displayingcontent has changed and the type and function of content have increased,the existing interaction methods, such as simply selecting a button ortouching a screen, may not be sufficient to perform various functions ofa user terminal device.

Particularly, a user terminal device of which display can be folded withreference to a folding line has been developed in order to minimize thesize of the user terminal device. When the display is foldedsymmetrically with reference to the folding line, however, the displayis folded completely and a user may not use or watch the display.

SUMMARY

Aspects of one or more exemplary embodiments relate to a user terminaldevice that, when a display is folded asymmetrically with reference to afolding line, exposes a part of the display, provides various UserInterface (UI) through the exposed area, and a displaying methodthereof.

According to an aspect of an exemplary embodiment, there is provided adisplaying method of a user terminal device including a display which isdivided into a first area and a second area by a folding line, thesecond area being larger than the first area and including an exposurearea that is exposed while the display is folded along the folding linesuch that the first area faces the second area, the method includingdisplaying a first screen on the first area and the second area,detecting at least one of a first folding interaction of folding thedisplay such that the first area faces the second area and a secondfolding interaction of folding the display such that a first covercorresponding to the first area faces a second cover corresponding tothe second area while the first screen is displayed, and in response todetecting the first folding interaction, displaying a second screenrelated to the first screen on the exposure area, and in response todetecting the second folding interaction, displaying a third screenrelated to the first screen on one of the first area and the secondarea, and the first screen.

In response to an incoming telephone call, the first screen is a screenfor indicating the telephone call, one of the second screen and thethird screen may be a screen for refusing the telephone call, and another screen of the second screen and the third screen may be a screenfor accepting the telephone call.

In response to the first screen including information, one of the secondscreen and the third screen may be a screen including brief summaryinformation of the information.

In response to the first screen including one or more application icons,one of the second screen and the third screen may be a screen where eachof the one or more application icons is classified and included in acorresponding folder according to its classification.

The method may further include displaying a visual effect of changing anobject or an image content on the display.

According to an aspect of another exemplary embodiment, there isprovided a displaying method of a user terminal device including adisplay which is divided into a first area and a second area by afolding line, the second area being larger than the first area andincluding an exposure area that is exposed while the display is foldedalong the folding line such that the first area faces the second area,the method including displaying a first screen on the exposure area,detecting at least one of an unfolding interaction of unfolding thedisplay and a folding interaction of folding the display such that afirst cover corresponding to the first area faces a second covercorresponding to the second area, and in response to detecting theunfolding interaction, displaying a second screen related to the firstscreen on the first area and the second area, and in response todetecting the folding interaction, displaying a third screen related tothe first screen on the first area or the second area.

In response to the first screen including information, one of the secondscreen and the third screen may be a screen including detailedinformation of the information.

According to an aspect of another exemplary embodiment, there isprovided a displaying method of a user terminal device including adisplay which is divided into a first area and a second area by afolding line, the second area being larger than the first area andincluding an exposure area that is exposed while the display is foldedalong the folding line such that the first area faces the second area,the method including displaying a first screen on the first area and thesecond area, detecting at least one of a first flap interaction offolding the display forward up to a predetermined angle range and thenunfolding the display and a second flap interaction of folding thedisplay backward up to a predetermined angle range and then unfoldingthe display, and in response to detecting the first flap interaction,displaying a second screen related to the first screen on the secondarea, and in response to detecting the second flap interaction,displaying a third screen related to the first screen on the secondarea.

In response to the first screen including information, one of the secondscreen and the third screen may be a screen including brief summaryinformation of the information, and an other screen of the second screenand the third screen may be a screen including detailed information ofthe information.

In response to the first screen being a screen including an imagecontent, one of the second screen and the third screen may be a screendisplaying the image content magnified, and an other screen of thesecond screen and the third screen may be a screen displaying the imagecontent reduced.

According to an aspect of still another exemplary embodiment, there isprovided a user terminal device including a display which is dividedinto a first area and a second area by a folding line, the second areabeing larger than the first area and including an exposure area that isexposed while the display is folded along the folding line such that thefirst area faces the second area, the device including a displayconfigured to display a first screen on the first area and the secondarea, a detector configured to detect, while the first screen isdisplayed, a first folding interaction of folding the display such thatthe first area faces the second area and a second folding interaction offolding the display such that a first cover corresponding to the firstarea faces a second cover corresponding to the second area, and acontroller configured to, in response to detecting the first foldinginteraction, display a second screen related to the first screen on theexposure area, and in response to detecting the second foldinginteraction, display a third screen related to the first screen on thefirst area or the second area.

In response to an incoming telephone call, the first screen may be ascreen for indicating the telephone call, one of the second screen andthe third screen may be a screen for refusing the telephone call, and another screen of the second screen and the third screen may be a screenfor accepting the telephone call.

In response to the first screen including information, one of the secondscreen and the third screen may be a screen including brief summaryinformation of the information.

In response to the first screen including one or more application icons,one of the second screen and the third screen may be a screen where eachof the one or more application icons is classified and included in acorresponding folder according to its classification.

The controller may control the display to display a visual effect ofchanging an object or an image content on the display.

According to an aspect of yet another exemplary embodiment, there isprovided a user terminal device including a display which is dividedinto a first area and a second area by a folding line, the second areabeing larger than the first area and including an exposure area that isexposed while the display is folded along the folding line such that thefirst area faces the second area, the device including a displayconfigured to display a first screen on the exposure area, a detectorconfigured to detect an unfolding interaction of unfolding the displayand a folding interaction of folding the display such that a first covercorresponding to the first area faces a second cover corresponding tothe second area, and a controller configured to, in response todetecting the unfolding interaction, displaying a second screen relatedto the first screen on the first area and the second area, and inresponse to detecting the folding interaction, displaying a third screenrelated to the first screen on the first area or the second area.

In response to the first screen including information, one of the secondscreen and the third screen may be a screen including detailedinformation of the information.

According to an aspect of another exemplary embodiment, there isprovided a user terminal device including a display which is dividedinto a first area and a second area by a folding line, the second areabeing larger than the first area and including an exposure area that isexposed while the display is folded along the folding line such that thefirst area faces the second area, the device including a displayconfigured to display a first screen on the first area and the secondarea, a detector configured to detect a first flap interaction offolding the display forward up to a predetermined angle range withreference to the folding line and then unfolding the display and asecond flap interaction of folding the display backward up to apredetermined angle range and then unfolding the display, and acontroller configured to, in response to detecting the first flapinteraction, display a second screen related to the first screen on thesecond area, and in response to detecting the second flap interaction,display a third screen related to the first screen on the second area.

In response to the first screen including information, one of the secondscreen and the third screen may be a screen including brief summaryinformation of the information, and an other screen of the second screenand the third screen may be a screen including detailed information ofthe information.

In response to the first screen being a screen including an imagecontent, one of the second screen and the third screen may be a screendisplaying the image content magnified, and an other screen of thesecond screen and the third screen may be a screen displaying the imagecontent reduced.

Meanwhile, according to an aspect of another exemplary embodiment, acomputer readable recording medium where a program for executing theabove-described method is recorded may be provided.

In addition, another method for realizing an aspect of an exemplaryembodiment, another system, and a computer readable recording mediumwhere a computer program for executing the above-described method may befurther provided.

As described above, according to various exemplary embodiments, a usermay perform various functions of a user terminal device through a UIdisplayed on the exposure area even when the display is folded, and maybe provided with various information.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or other aspects of exemplary embodiments will become moreapparent from the following description with reference to theaccompanying drawings, in which:

FIG. 1 is a block diagram illustrating configuration of a user terminaldevice briefly according to an exemplary embodiment;

FIG. 2 is a block diagram illustrating a detailed configuration of auser terminal device according to an exemplary embodiment;

FIGS. 3A to 3E are views illustrating a user terminal device with arectangular display panel according to an exemplary embodiment;

FIG. 4 is a view illustrating a configuration of software stored in astorage according to an exemplary embodiment;

FIGS. 5A to 7B are views illustrating a UI displayed on an exposure areaaccording to various exemplary embodiments;

FIGS. 8A to 16B are views illustrating various exemplary embodimentswhere a user terminal device performs various functions according to afolding interaction and an unfolding interaction;

FIGS. 17A to 34 are views illustrating various exemplary embodiments formaintaining functions of a user terminal device when a foldinginteraction and an unfolding interaction are detected; and

FIGS. 35 to 37 are illustrating a displaying method of a user terminaldevice according to an exemplary embodiment.

DETAILED DESCRIPTION

Specific exemplary embodiments will be described with reference toaccompanying drawings and detailed explanation. However, this does notnecessarily limit the scope of the exemplary embodiments to a specificform. Instead, modifications, equivalents and replacements included inthe disclosed concept and technical scope of this specification may beemployed. While describing exemplary embodiments, if a specificdescription regarding a known technology might obscure the gist of aninventive concept, the specific description may be omitted.

In the present disclosure, relational terms such as first and second,and the like, may be used to distinguish one entity from another entity,without necessarily implying any actual relationship or order betweensuch entities.

The terms used in the following description are provided to explain aspecific exemplary embodiment and are not intended to limit the scope ofrights. A singular term includes a plural form unless it expressly saysotherwise. The terms, “include”, “comprise”, “is configured to”, etc. ofthe description are used to indicate that there are features, numbers,steps, operations, elements, parts or a combination thereof, and theyshould not exclude the possibilities of combination or addition of oneor more features, numbers, steps, operations, elements, parts orcombination thereof.

In an exemplary embodiment, ‘a module’ or ‘a unit’ performs at least onefunction or operation, and may be realized as hardware, software, orcombination thereof. In addition, a plurality of ‘modules’ or aplurality of ‘units’ may be integrated into at least one module and maybe realized as at least one processor except for ‘modules’ or ‘units’that should be realized in a specific hardware.

Hereinafter, an exemplary embodiment will be described in detail withreference to accompanying drawings. FIG. 1 is a block diagramillustrating configuration of a user terminal device 100 according to anexemplary embodiment. As illustrated in FIG. 1, the user terminal device100 includes a display 110, a detector 120, and a controller 130. Theuser terminal device 100 may be realized as various types of devices,such as a TV, monitor, PC, laptop PC, mobile phone, tablet PC,touchscreen, PDA, MP3 player, kiosk, electronic album, table displaydevice, LCD display, LED display, OLED display, camera, watch, wearabledevice, etc. If a user terminal device is realized as a portable device,such as mobile phone, tablet PC, PDA, MP3 player, laptop PC, watch,wearable device, etc., the user terminal device may be referred to as amobile device. Throughout this specification, for convenience and notfor any limiting purposes, it may be referred to as a user terminaldevice.

The display 110 displays various image data and UIs. In particular, thedisplay 110 may be realized as a touch screen as it is combined with atouch detector. In addition, the display 110 may include a folding lineso that the display 110 may be folded.

In particular, the display 110 is divided by a folding line to form afirst area and a second area which is larger than the first area. If thedisplay is folded such that the first area comes in touch with thesecond area, the display 110 may display on an exposure area of thesecond area, the area exposed while the display 110 is folded, at leastone of a UI including information regarding the user terminal device 100and a UI for controlling the user terminal device 100.

The detector 120 detects a user interaction. In particular, the detector120 may include a touch detector which detects a user's touchinteraction. In addition, the detector 120 may include a foldingdetector which detects a folding interaction of folding the display 110and an unfolding interaction of unfolding the display 110.

The controller 130 controls overall operations of the user terminaldevice 100. In particular, if the detector 120 detects a first foldinginteraction of folding the display 110 forward such that the first areafaces the second area with reference to the folding line while a firstscreen is displayed on the first area and the second area, thecontroller 130 may control the display 110 to display a second screenrelated to the first screen on the exposed area of the second area inresponse to the first folding interaction. In addition, if the detector120 detects a second folding interaction of folding the display 110backward such that a first cover corresponding to the first area faces asecond cover corresponding to the second area with reference to thefolding line while the first screen is displayed on the first area andthe second area, the controller 130 may control the display 110 todisplay a third screen related to the first screen on the first area orthe second area. In this case, the first screen, the second screen, andthe third screen may be different from one another.

One or more exemplary embodiments will be described in greater detailwith reference to FIGS. 2 to 23B. FIG. 2 is a block diagram illustratingconfiguration of a user terminal device 200 in detail according to anexemplary embodiment. As illustrated in FIG. 2, the user terminal deviceincludes an image receiver 210, an image processor 220, a display 230, acommunicator 240, a storage 250, an audio processor 260, a speaker 270,a detector 280, and a controller 290.

Meanwhile, FIG. 2 illustrates various components of the user terminaldevice 200 having various functions, such as a content providingfunction, display function, etc. Accordingly, according to one or moreexemplary embodiments, a part of the components illustrated in FIG. 2may be omitted or changed, or other components may be further added.

The image receiver 210 receives image data through various sources. Forexample, the image receiver 210 may receive broadcasting data from anexternal broadcasting station, VOD data in real time from an externalserver, or image data from an external apparatus.

The image processor 220 processes image data received from the imagereceiver 210. The image processor 220 may perform various imageprocessing with respect to image data, such as decoding, scaling, noisefiltering, frame rate conversion, resolution conversion, etc.

The display 230 displays at least one of a video frame which isgenerated as the image processor 220 processes image data received fromthe image receiver 220 and various screens generated by a graphicprocessor 293.

In particular, as illustrated in FIG. 3A, the display 230 may consist ofa first area 320 and a second area 330 which is larger than the firstarea 320 with reference to a folding line 310. As illustrated in FIG.3B, if the display 230 is folded with reference to the folding line 310,the display 230 may include an exposure area 340 which is the exposedpart of the second area 330. Meanwhile, FIG. 3C is a view illustrating acover which is on the rear side of the user terminal device 200 when theuser terminal device 200 is folded. In other words, the rear side of theuser terminal device 200 may include a first cover 350 corresponding tothe first area 320 and a second cover 360 corresponding to the secondarea 330.

Meanwhile, in the above-described exemplary embodiment, the length ofthe folding line 310 is parallel with a short side, but this is only anexample. As illustrated in FIG. 3D, the length of the folding line 310may be in parallel with a long side. In this case, the display 230 mayconsist of a first area 370 and a second area 380 with reference to thefolding line 310. As illustrated in FIG. 3E, if the display 230 isfolded with reference to the folding line 310, the display 230 mayinclude an exposure area 390 of the second area 380, which is exposed tooutside.

Meanwhile, in the above-exemplary embodiment, the folding line 310 maybe a line generated by a physical hinge. In addition, if the display 230is a flexible display, the folding line 310 may be a line which can befolded by a user.

The communicator 240 performs communication with various types ofexternal apparatuses according to various types of communicationmethods. The communicator 240 may include a WiFi chip 241, a Bluetoothchip 242, a wireless communication chip 243, and a Near FieldCommunication (NFC) chip 244. The controller 290 performs communicationwith various external apparatuses using the communicator 240.

In particular, the WiFi chip 241 and the Bluetooth chip 242 performcommunication according to a WiFi method and a Bluetooth method,respectively. In the case of the WiFi chip 241 or the Bluetooth chip242, various connection information, such as an SSID and a session key,may be transmitted/received first for communication connection and then,various information may be transmitted/received. The wirelesscommunication chip 243 represents a chip which performs communicationaccording to various communication standards such as IEEE, Zigbee,3^(rd) Generation (3G), 3^(rd) Generation Partnership Project (3GPP),Long Term Evolution (LTE) and so on. The NFC chip 244 represents a chipwhich operates according to an NFC method which uses 13.56 MHz bandamong various RF-ID frequency bands such as 135 kHz, 13.56 MHz, 433 MHz,860˜960 MHz, 2.45 GHz, and so on.

The storage 250 may store various programs and data necessary to operatethe user terminal device 200. Specifically, the storage 250 may storeprograms and data to configure various screens to be displayed on a mainarea and a sub area. FIG. 4 is a view provided to explain the structureof software stored in the user terminal device 200. According to FIG. 4,the storage 250 may store an Operating System (OS) 410, a kernel 420,middleware 430, an application 440, etc.

The OS 410 controls and manages overall operations of hardware. In otherwords, the OS 410 manages hardware and is responsible for basicfunctions such as memory and security.

The kernel 420 serves as a path transmitting various signals detected atthe display 230, such as a touch signal, to the middleware 430.

The middleware 430 includes various software modules for controlling theoperation of the user terminal device 200. According to FIG. 4, themiddleware 430 includes an X11 module 430-1, an APP manager 430-2, aconnection manager 430-3, a security module 430-4, a system manager430-5, a multimedia framework 430-6, a UI framework 430-7, a windowmanager 430-8, and a writing recognition module 430-9.

The X11 module 430-1 receives various event signals from varioushardware provided in the user terminal device 200. Herein, the event mayvary, ranging from an event of setting of a system alarm, an event ofexecuting or terminating a specific program, etc.

The APP manager 430-2 manages the execution state of variousapplications 440 which are installed in the storage 250. When anapplication execution event is detected from the X11 module 430-1, theAPP manager 430-2 calls and executes an application corresponding to theevent.

The connection manager 430-3 supports wired or wireless networkconnection. The connection manager 430-3 may include various detailedmodules such as a DNET module, a UPnP module, etc.

The security module 430-4 supports certification, permission, securestorage, etc., with respect to hardware.

The system manager 430-5 monitors the state of each element of the userterminal device 200, and provides the monitoring result to othermodules. For example, if there is not enough battery left, an erroroccurs, or connection is cut off, the system manager 430-5 may providethe monitoring result to a main UI framework 430-7 or a sub UI framework430-9 and output an alarm message or an alarm sound.

The multimedia framework 430-6 may be stored in the user terminal device200, or may reproduce multimedia content provided from an externalsource. The multimedia framework 430-6 may include a player module, acamcorder module, a sound processing module, etc. Accordingly, themultimedia framework 430-6 may reproduce various multimedia content, andgenerate and reproduce screens and sounds.

The main UI framework 430-7 provides various UIs to be displayed on amain area of the display 230, and the sub UI framework 430-9 providesvarious UIs to be displayed on a sub area. The main UI framework 430-7and the sub UI framework 430-9 may include an image composite module toconfigure various objects, a coordinates composite module to calculate acoordinates where an object is to be displayed, a rendering module torender the configured object on the calculated coordinates, a 2D/3D UItoolkit to provide a tool for configuring a UI in 2D or 3D form, etc.The main UI framework 430-7 and the sub UI framework 430-9 may includean image composite module to configure various objects, a coordinatescomposite module to calculate a coordinates where an object is to bedisplayed, a rendering module to render the configured object on thecalculated coordinates, a 2D/3D UI toolkit to provide a tool forconfiguring a UI in 2D or 3D form, etc.

The window manager 430-8 may detect a touch event using a user's bodypart or pen or other input events. When such an event is detected, thewindow manager 430-8 transmits an event signal to the main UI framework430-7 or the sub UI framework 430-9 so that an operation correspondingto the event is performed.

In addition, if a user touches and drags a screen, various programmodules such as a writing module for drawing a line according to a dragtrace and an angle calculation module for calculating a pitch angle, aroll angle, a yaw angle, etc. based on a sensor value sensed by amovement detector 282 may be stored.

The application module 440 includes applications 440-1˜440-n forsupporting various functions. For example, program modules for providingvarious services, such as a navigation program module, a game module, anelectronic book module, a calendar module, an alarm management module, amusic module, an electronic banking module, a stock module, a calculatormodule, an electronic mail module, a spreadsheet module, a wordprocessor module, etc. may be included. Such applications may be set asdefault or may be set temporarily by a user when necessary. If an objectis selected, the main CPU 294 may execute an application correspondingto the selected object using the application module 440.

The software structure displayed in FIG. 4 is only an example and thus,an exemplary embodiment is not necessarily limited thereto. Thus, partof the structure may be omitted or changed, or new structure may beadded, if necessary. For example, the storage 250 may additionallyprovide various programs such as a sensing module for analyzing signalssensed by various sensors, a messaging module including a messengerprogram, a Short Message Service (SMS) & Multimedia Message Service(MMS) program, an e-mail program, etc., a call info aggregator programmodule, a VoIP module, a web browser module, etc.

Referring back to FIG. 2, the audio processor 260 processes audio dataof image content. The audio processor 260 may perform various processingsuch as decoding, amplification, noise filtering, compression,equalization, noise cancellation, echo or reverb removal or addition,etc. with respect to audio data. The audio data processed by the audioprocessor 260 may be output to the audio output unit 270 (e.g., audiooutputter).

The audio output unit 270 outputs not only various audio data which isprocessed in many ways such as decoding, amplification, and noisefiltering by the audio processor 260, but also various alarm sounds orvoice messages. In particular, the audio output unit 270 may be realizedas a speaker, but this is only an example. The audio output unit 270 maybe realized as an output terminal which may output audio data.

The detector 280 detects various user interactions. In particular, thedetector 280 may include a touch detector 281, a movement detector 282,and a folding detector 283, as illustrated in FIG. 2.

Specifically, the touch detector 281 may detect a user's touchinteraction using a touch panel attached to the rear side of a displaypanel. The movement detector 282 may detect a movement (for example, arotation movement, a vertical movement, a horizontal movement, etc.) ofthe user terminal device 100 using at least one of an acceleratorsensor, a geomagnetic sensor, and a gyro sensor. The folding detector283 may detect at least one of whether the user terminal device 200 isfolded with reference to the folding line 310 and the angle at which theterminal device 200 is folded using a bending sensor (for example, alight sensor, a fiber optic sensor, a conductive ink-based sensor, aconductive fabric sensor, etc.).

Meanwhile, the touch detector 281 might activate only a touch sensordisposed on the exposure area while the display 230 is folded, andinactivate a touch sensor disposed on the other areas.

The controller 290 controls overall operations of the user terminaldevice 200 using various programs stored in the storage 250.

As illustrated in FIG. 2, the controller 290 includes a RAM 291, a ROM292, a graphic processor 293, a main CPU 294, a first to an nthinterface 295-1˜295-n, and a bus 296. In this case, the RAM 291, the ROM292, the graphic processor 293, the main CPU 294, the first to the nthinterface 295-1˜295-n, etc. may be interconnected through the bus 296.

The ROM 292 stores a set of commands for system booting. If a turn-oncommand is input and thus power is supplied, the main CPU 294 copies O/Sstored in the storage 250 to the RAM 291 according to a command storedin the ROM 292, and boots a system by executing the O/S. When thebooting is completed, the main CPU 294 copies various applicationprograms stored in the storage 250 to the RAM 291, and executes theapplication programs copied in the RAM 291 to perform variousoperations.

The graphic processor 293 generates a screen including various objects,such as an icon, an image, a text, etc., using an computing unit and arendering unit. The computing unit (e.g., computer) computes propertyvalues such as coordinates, shape, size, and color of each object to bedisplayed according to the layout of the screen using a control commandreceived from the detector 280. The rendering unit (e.g., renderer)generates a screen with various layouts including objects based on theproperty values computed by the computing unit. The screen generated bythe rendering unit is displayed in a display area of the display 230.

The main CPU 294 accesses the storage 250, and performs booting usingthe O/S stored in the storage 250. The main CPU 294 performs variousoperations using various programs, content, data, etc. stored in thestorage 250.

The first to the nth interface 295-1˜295-n are connected to theabove-described various elements. One of the above interface may be anetwork interface which is connected to an external apparatus vianetwork.

In particular, the controller 290 may provide various functions using anexposure area which is exposed to the outside when the display 110 isfolded.

A UI Provided on the Exposure Area

If the display 230 is folded with reference to the folding line 310 suchthat the first area 320 and the second area 330 come in contact witheach other, the controller 290 may control the display 230 to display apredetermined UI on the exposure area 340 of the second area 320, whichis exposed to the outside. In this case, the predetermined UI mayinclude at least one of a UI including the state information of the userterminal device 200 and a UI for controlling the user terminal device200.

In an exemplary embodiment, if a folding interaction of folding thedisplay 230 with reference to the folding line 310 such that the firstarea 320 and the second area 330 come in contact with each other isdetected, the controller 290 may control the display 230 to display a UI510 providing a memo function on the exposure area, as illustrated inFIG. 5A. In this case, if a user input, e.g., a finger, pen, or stylus,is detected through the UI 510 which provides a memo function, thecontroller 290 may control the display 230 to display an image accordingto the user input.

In addition, the controller 290 may control the display 230 to display aUI for controlling a specific application on the exposure area.Specifically, if a folding interaction of folding the display 230 withreference to the folding line 310 such that the first area 320 and thesecond area 330 come in contact with each other is detected while aspecific application is executed, the controller 290 may control thedisplay 230 to display a UI for controlling the specific application onthe exposure area. For example, as shown in FIG. 5B, if a foldinginteraction of folding the display 230 with reference to the foldingline 310 such that the first area 320 and the second area 330 come incontact with each other is detected while a music application isexecuted, the controller 290 may control the display 230 to display a UI520 for controlling the music application on the exposure area. In thiscase, the UI 520 for controlling a music application may includeinformation regarding currently-played music, a play/stop icon, a skipicon, a rewind icon, a next song, a past song, thumbs up, thumbs down,etc.

In addition, the controller 290 may control the display 230 to display aUI including a hot key icon for checking the current state of the userterminal device 200 on the exposure area. For example, if apredetermined user interaction (for example, an interaction of touchingor tapping the exposure area twice in a row) is detected while thedisplay 230 is folded, the controller 290 may control the display 230 todisplay a UI 530 including a hot key icon for checking the current stateof the user terminal device 200 on the exposure area as illustrated inFIG. 5C. In this case, the hot key icon for checking the current stateof the user terminal device 200 may include a hot key icon for checkinga battery state, a hot key icon for checking a network state, a hot keyicon for checking display brightness setting, etc.

In addition, the controller 290 may control the display 230 to display aUI informing that a message or data is received from outside on theexposure area. For example, if an social network service (SNS) messageis received from outside through the communicator 240 while the display230 is folded, the controller 290 may control the display 230 to displaya UI 540 informing that the SNS message is received on the exposure areaas illustrated in FIG. 5D. In this case, the UI 540 informing that anSNS message is received may include at least one of informationregarding a sender and information regarding the SNS message.

Further, the controller 290 may control the display 230 to displayvarious types of UIs for releasing a lock state of the user terminaldevice 200 on the exposure area.

Specifically, as illustrated in FIG. 6A, the controller 290 may controlthe display 230 to display a UI 610 for inputting a pin number torelease the lock state of the user terminal device 200 on the exposurearea. In this case, the UI 610 for inputting a pin number may change thepin number by a touch interaction of swiping up and down. If apredetermined pin number is input on the UI 610 displayed on theexposure area, the controller 290 may release the lock state of the userterminal device 200. Additionally, the user may set the pin numberthrough user input.

In addition, as illustrated in FIG. 6B, the controller 290 may controlthe display 230 to display a UI 620 including a plurality of dots on acorner of the exposure area to release the lock state of the userterminal device 200 on the exposure area. In this case, if a touchinteraction of connecting dots in a predetermined pattern is detected onthe UI 620, the controller 290 may release the lock state of the userterminal device 200. Additionally, the user may set the pattern throughuser input.

As illustrated in FIG. 6C, the controller 290 may control the display230 to display a UI 630 in the form of a keyboard, i.e., piano, torelease the lock state of the user terminal device 200 on the exposurearea. In this case, if a touch interaction of touching the keyboard in apredetermined rhythm is detected on the UI 630, the controller mayrelease the lock state of the user terminal device 200. Additionally,the user may set the rhythm through user input.

In addition, as illustrated in FIG. 6D, the controller 290 may controlthe display 230 to display a UI 640 including a home icon to release thelock state of the user terminal device on the exposure area. In thiscase, if a touch interaction of pinching out with reference to the homeicon included in the UI 640 is detected, the controller 290 may releasethe lock state of the user terminal device 200.

The controller 290 may control the display 230 to display a UI forchanging the setting of the user terminal device 200 on the exposurearea.

Specifically, as illustrated in FIG. 7A, the controller 290 may controlthe display 230 to display a UI 710 in the form of an arc for adjustingthe volume of the user terminal device 200. Meanwhile, in the aboveexemplary embodiment, the UI displayed on the exposure area adjusts thevolume, but this is only an example. A UI for adjusting another settingof the user terminal device 200 (for example, display brightness, etc.)may be displayed.

In addition, as illustrated in FIG. 7B, if a touch interaction ofdragging one of a plurality of vertexes included in the exposure area ina diagonal direction is detected, the controller 290 may control thedisplay 230 to display a UI 730 for turning off the power of the userterminal device 200 at the corner area corresponding to the vertex wherethe touch interaction is detected.

A Folding Interaction and an Unfolding Interaction

If a plurality of icons are displayed on the exposure area while thedisplay 230 is folded, and an unfolding interaction of unfolding thedisplay 230 while one of the plurality of icons is touched, thecontroller 290 may control the display 230 to display a screencorresponding to the touched icon on full screen.

Specifically, as illustrated in FIG. 8A, the display 230 displays firstto fourth icons 810 to 840 while the display 230 is folded. If anunfolding interaction of unfolding the display 230 is detected while thefourth icon 840 out of the first to the fourth icon 810 to 840 istouched, the controller 290 may control the display 230 to display afull screen message window 850 corresponding to the fourth icon 840, asillustrated in FIG. 8B.

Meanwhile, in the above exemplary embodiment, an unfolding interactionis detected while the fourth icon 840 is touched, but this is only anexample. If an unfolding interaction is detected while another icon istouched, a screen corresponding to the other touched icon may bedisplayed on the full screen of the display 230. For example, if anunfolding interaction is detected while the first icon 810 is touched,the controller 290 may control the display 230 to display a full screenexecution screen of a call application corresponding to the first icon810 (for example, a recent call list screen, an address book screen, acall sending screen, etc.). In addition, if an unfolding interaction isdetected while the second icon 820 is touched, the controller 290 maycontrol the display 230 to display a web browser screen corresponding tothe second icon 820 on full screen. If an unfolding interaction isdetected while the third icon 830 is touched, the controller 290 maycontrol the display 230 to display a full screen execution screen of amusic application corresponding to the third icon 830 (for example, amusic play screen, a music list screen, etc.).

In addition, if the exposure area is touched while the display 230 isfolded and then, an unfolding interaction of unfolding a hinge angle ofthe display 230 as much as a predetermined angle is detected, thecontroller 290 may control the display 230 to display a screen forexecuting a specific function.

Specifically, if a call request is received while the display 230 isfolded, the controller 290 may control the display 230 to display a UI910 informing that a call request is received on the exposure area, asillustrated in FIG. 9A. If an unfolding interaction of unfolding a hingeangle of the display 230 as much as a predetermined angle (for example,70° to 120°) is detected while the UI 910 informing that a call requestis received is touched, the controller 290 may accept the call request,execute a speaker phone function, and control the display 230 to displayan execution screen 920 including various icons, as illustrated in FIG.9B.

Specifically, if a message is received from outside while newsinformation 1010 is displayed at the same as the display 230 is folded,the controller 290 may control the display 230 to display a UI 1020informing that the message is received along with the news information1010 on the exposure area as illustrated in FIG. 10A. If an unfoldinginteraction of unfolding a hinge angle of the display 230 as much as apredetermined angle (for example, 70° to 120°) is detected while the UI1020 informing that a message is received is touched, the controller 290may control the display 230 to display a message window 1030 for writinga reply to the received message, as illustrated in FIG. 10B.

In addition, the controller 290 may control the display 230 to displaydifferent screens when the exposure area is touched and then, anunfolding interaction is detected and when an unfolding interaction isdetected.

Specifically, the controller 290 may control the display 230 to displaya UI 1110 corresponding to a music application on the exposure area asillustrated in FIG. 11A.

If a message is received from outside while the UI 1110 corresponding toa music application is displayed on the exposure area, the controller290 may control the display 230 to display a UI 1120 informing that themessage is received along with the music application UI 1110 on theexposure area as illustrated in FIG. 11B.

In this case, if an unfolding interaction of unfolding the display 230is detected while the exposure area is not touched, the controller 290may control the display 230 to display an execution screen 1130 of theexisting music application as illustrated in FIG. 11C. In this case, aUI 1135 informing that a message is received may be displayed on onearea of the execution screen 1130 of the music application for apredetermined time.

However, if an unfolding interaction of unfolding the display 230 isdetected while the UI 1120 informing that a message is received isdisplayed on the exposure area, the controller 290 may control thedisplay 230 to display a message window 1140 for writing a reply to thereceived message as illustrated in FIG. 11D.

In addition, the controller 290 may control the display 230 to displaydifferent screens in the order of detecting an unfolding interaction anda touch interaction for lock-releasing.

Specifically, as illustrated in the left side of FIG. 12A, if a touchinteraction for lock-releasing is detected while a UI 1210 for releasingthe lock of the user terminal device 200 is displayed on the exposurearea, the controller 290 may release the lock state of the user terminaldevice 200, and as illustrated in the right side of FIG. 12A, maycontrol the display 230 to display a first home screen 1220 includingtime information on the exposure area.

In addition, as illustrated in the left side of FIG. 12B, if a touchinteraction for lock-releasing is detected while the UI 1210 forreleasing the lock of the user terminal device 200 is displayed on theexposure area, and an unfolding interaction is detected, the controller290 may release the lock state of the user terminal device 200, and asillustrated in the right side of FIG. 12B, may control the display 230to display a second home screen 1230 on full screen.

As illustrated in the left side of FIG. 12C, if an unfolding interactionis detected while an image is not displayed on the exposure area, thecontroller 290 may control the display 230 to display a UI 1240 forreleasing the lock of the user terminal device on full screen asillustrated in the right side of FIG. 12C. If a touch interaction forlock-releasing is detected on the UI 1240 for releasing the lock of theuser terminal device 200, which is displayed on full screen, thecontroller 290 may release the lock state of the user terminal device200, and as illustrated in the right side of FIG. 12B, may control thedisplay 230 to display the second home screen 1230 on full screen.

In addition, the controller 290 may control the display 230 to displaydistinctively a screen which is displayed when only an unfoldinginteraction is detected while a UI corresponding to a specificapplication is displayed on the exposure area and a screen which isdisplayed when an unfolding interaction is detected after the exposurearea is touched.

Specifically, if a call request is received from outside while thedisplay 230 is folded, the controller 290 may control the display 230 todisplay a UI 1310 informing a call request is received on the exposurearea as illustrated in the left side of FIG. 13A. If the UI 1310displayed on the exposure area is touched and then an unfoldinginteraction of unfolding the display 230 is detected, the controller 290may control the display 230 to display an execution screen 1320 of acalendar application which is related to a call request function on fullscreen (in another example, an execution screen of a memo application)as illustrated in the lower left side of FIG. 13A. On the other hand, ifan unfolding interaction of unfolding the display 230 is detected whilethe UI 1310 displayed on the exposure area is not touched, thecontroller 290 may control the display 230 to display a call screen 1330on full screen as illustrated in the lower right side of FIG. 13A.

If a folding interaction of folding the display 230 is detected while amusic application is executed, the controller 290 may control thedisplay 230 to display a UI 1340 for controlling the music applicationon the exposure area as illustrated in the upper portion of FIG. 13B. Ifthe UI 1340 displayed on the exposure area is touched and then, anunfolding interaction of unfolding the display 230 is detected, thecontroller 290 may control the display 230 to maintain music play anddisplay a play list 1350 on full screen as illustrated in the lower leftside of FIG. 13B. On the other hand, if an unfolding interaction ofunfolding the display 230 is detected while the UI 1340 displayed on theexposure area is not touched, the controller 290 may control the display230 to display a music player screen 1360 on full screen as illustratedin the lower right side of FIG. 13B.

If a first unfolding interaction of unfolding a hinge angle of thedisplay 230 as much as a predetermined angle is detected, the controller290 may control the display 230 to display at least one icon forexecuting a specific function. If a second unfolding interaction ofunfolding the display 230 completely while at least one icon is touched,the controller 290 may execute a function corresponding to the touchedicon.

According to an exemplary embodiment, if a call request is received fromoutside while the display 230 is folded, the controller 290 may controlthe display 230 to display a UI 1410 informing that a call request isreceived on the exposure area as illustrated in FIG. 14A.

If the first unfolding interaction of unfolding a hinge angle of thedisplay 230 as much as a predetermined angle (for example, 30° to 150°)is detected while the UI 1410 informing that a call request is receivedis displayed, the controller 290 may control the display 230 to displaya UI 1420 including a plurality of icons 1430-1 to 1430-3 for performingvarious functions in relation with making a call as illustrated in FIG.14B.

If an unfolding interaction of completely unfolding the display 230(that is, unfolding the display 230 such that a hinge angle of thedisplay 230 becomes 180°) is detected while a photo sharing icon istouched from among the plurality of icons 1430-1 to 1430-3, thecontroller 290 may accept a call request, and as illustrated in FIG.14C, may control the display 230 to display a call screen 1440 on theupper area and a list 1450 for selecting a photo to be shared. In thiscase, if a touch interaction of dragging one of a plurality of photosincluded in the list 1450 to the call screen 1440 is selected, thecontroller 290 may control the communicator 240 to transmit the photowhere the touch interaction is detected to a receiver.

If an unfolding interaction is detected, the controller 290 may controlthe display 230 to display a plurality of guidance messages according toa hinge angle of the display 230 while the unfolding interaction isdetected. In this case, the guidance messages may include a guidancemessage for informing an incoming text message, a guidance message forinforming a missed call, a guidance message for informing an incoming anSNS message, a guidance message for informing of application updates,etc.

Specifically, as illustrated in FIG. 15A, the controller 290 may controlthe display 230 to display one guidance message 1510 while the display230 is folded. Subsequently, if an unfolding interaction of unfoldingthe display 230 is detected, the controller 290 may control the display230 to display a different number of guidance messages according to ahinge angle of the display 230. For example, if a hinge angle of thedisplay 230 is within a first angle range (for example, between 5° and15°), the controller 290 may control the display 230 to display twoguidance messages 1510, 1520. If a hinge angle of the display 230 iswithin a second angle range (for example, between 15° and 25°), thecontroller 290 may control the display 230 to display three guidancemessages 1510, 1520, 1530. That is, the controller 290 may increase thenumber of guidance messages displayed as a hinge angle of display 230becomes greater.

If a hinge angle of the display 230 is within a fourth angle range (forexample, between 35° and 45°), the controller 290 may control thedisplay 230 to display five guidance messages (possibly overlapping)1510 to 1550, as illustrated in FIG. 15B. In this case, as illustratedin FIG. 15B, the first guidance message 1510 which is updated mostrecently may be disposed on the top.

As illustrated in FIG. 15B, if an folding interaction of folding thedisplay 230 again is detected when the second guidance message 1520 istouched while the five guidance messages 1510 to 1550 are displayed, thecontroller 290 may control the display 230 to display the secondguidance message 1520 on the exposure area as illustrated in FIG. 15C.

In addition, as illustrated in FIG. 15B, if an unfolding interaction ofunfolding the display 230 completely is detected when the secondguidance message 1520 is touched while the five guidance messages 1510to 1550 are displayed, the controller 290 may control the display 230 todisplay a screen corresponding to the second guidance message 1520 onfull screen as illustrated in FIG. 15D.

Further, the controller 290 may perform different functions according tothe direction of a touch interaction which is detected on the exposurearea while the display 230 is folded.

Specifically, if a message is received from outside while the display230 is folded, the controller 290 may control the display 230 to displaya UI 1610 informing that the message is received on the exposure area asillustrated in FIG. 16A.

In this case, if a touch interaction in the left-and-right direction isdetected on the UI 1610 informing that a message is received, thecontroller 290 may control the display 230 to display a UI informing theprevious message or the next message on the exposure area according tothe touch interaction.

If a touch interaction in the down direction is detected on the UI 1610informing that a message is received, the controller 290 may delete acurrently-received message.

If a touch interaction in the up direction is detected on the UI 1610informing that a message is received, the controller 290 may store thereceived messages. Specifically, as illustrated in FIG. 16B, if a touchinteraction in the up direction is detected on a UI 1620 informing thata first message is received, a touch interaction in the up direction isdetected on a UI 1630 informing a second message is received, a touchinteraction in the up direction is detected on a UI 1640 informing thata third message is received and then, an unfolding interaction ofunfolding the display 230 is detected, the controller 290 may controlthe display 230 to display a screen 1620′ including the first message, ascreen 1630′ including the second message, a screen 1640′ including thethird message and a home screen 1650 as illustrated in FIG. 16B.

Maintain the Current Function Despite the Change in the Shape of theDisplay 230

The controller 290 may maintain the current function even if the shapeof the display 230 changes according to a folding interaction or anunfolding interaction, and control the display 230 to display a screencorresponding to the current function.

According to an exemplary embodiment, if a folding interaction offolding the display 230 is detected while a music application isexecuted, the controller 290 may control the display 230 to display a UI1710 corresponding to the music application on the exposure area asillustrated in FIG. 17A. If a call request is received while the UI 1710corresponding to the music application is displayed on the exposurearea, the controller 290 may control the display 230 to display a UI1720 informing that a call request is received on the exposure area asillustrated in FIG. 17B. If an unfolding interaction of unfolding thedisplay 230 is detected while the UI 1720 informing that a call requestis received is displayed on the exposure area, the controller 290 maycontrol the display 230 to display a call screen 1730 on full screen asillustrated in FIG. 17C. Subsequently, when the telephone call iscompleted, the controller 290 may control the display 230 to display anexecution screen 1740 of the music application on full screen asillustrated in FIG. 17D. If a folding interaction of folding the display230 is detected again, the controller 290 may control the display 230 todisplay the UI 1710 corresponding to the music application on theexposure area as illustrated in FIG. 17E.

According to another exemplary embodiment, as illustrated in FIG. 18A,the controller 290 may control the display 230 to display an executionscreen 1810 of a music application on full screen while the musicapplication is executed. If a call request is received from outside, thecontroller 290 may control the display 230 to display a screen 1820 forconfirming whether to accept the call request as illustrated in FIG.18B. If a folding interaction of folding the display 230 is detectedwhile the screen 1820 for confirming whether to accept the call requestis displayed, the controller 290 may control the display 230 to displaya UI 1830 informing that a call request is rejected on the exposure areaas illustrated in FIG. 18C. When the telephone call is completed, thecontroller 290 may control the display 230 to display a UI 1840corresponding to the music application on the exposure area asillustrated in FIG. 18D. Subsequently, if an unfolding interaction ofunfolding the display 230 is detected again, the controller 290 maycontrol the display 230 to display the execution screen 1810 of themusic application on full screen as illustrated in FIG. 18E.

The controller 290 may determine a display area which can be watched bya user according to a hinge angle of the display 230, and control thedisplay 230 to display a screen including different amount ofinformation on the determined display area. In this case, the hingeangle of the display 230 may be matched with the watchable display areaand then stored. According to an exemplary embodiment, if the display230 is unfolded while a telephone call is performed, the controller 290may control the display 230 to display a first telephone call screen1910 on full screen as illustrated in FIG. 19A.

If a hinge angle of the display 230 is folded as much as Θ while atelephone call is performed, the controller 290 may determine a displayarea corresponding to the hinge angle, and as illustrated in FIG. 19B,may control the display 230 to display a second telephone call screen1920 on the determined display area. In this case, the second telephonecall screen 1920 may include less information and fewer icons than thoseincluded in the first telephone call screen 1910.

In addition, if the display 230 is folded while a telephone call isperformed, the controller 290 may control the display 230 to display aUI 1930 informing that a telephone call is being performed on theexposure area as illustrated in FIG. 19C.

According to another exemplary embodiment, if the display 230 isunfolded while a navigation application is executed, the controller 290may control the display 230 to display a first navigation screen 2010 onfull screen as illustrated in FIG. 20A.

If a hinge angle of the display 230 is folded as much as Θ while anavigation application is executed, the controller 290 may determine adisplay area corresponding to the hinge angle, and as illustrated inFIG. 20B, may control the display 230 to display a second navigationscreen 2020 on the determined display area. In this case, the areaguided by the second navigation screen 2020 may be smaller than the areaguided by the first navigation screen 2010.

If the display 230 is folded while a navigation application is executed,the controller 290 may control the display 230 to display a thirdnavigation screen 2030 on the exposure area as illustrated in FIG. 20C.In this case, the third navigation screen 2030 may include onlydirection information and distance information instead of a map screenincluded in the first navigation screen 2010 and the second navigationscreen 2020. However, a map screen may also be included on the exposurearea in third navigation screen 2030.

Whenever a folding interaction or an unfolding interaction is detected,the controller 290 may control the display 230 to reconfigure anddisplay information such that the information corresponds to the sizeand direction of a screen.

Specifically, as illustrated in FIG. 21A, if a folding interaction offolding the display 230 is detected while a first address book list 2110is displayed on full screen, the controller 290 may control the display230 to display a second address book list 2120 on the exposure area asillustrated in FIG. 21B. In this case, the first address book list 2110might include user information such as image, name, telephone number,direct call icon, etc., and the second address book list 2120 mightinclude user information such as image and name only, but the display isnot limited to this.

In addition, as illustrated in FIG. 22A, if an unfolding interaction ofunfolding the display 230 is detected while a news title 2210 isdisplayed on the exposure area when the display 230 is folded, thecontroller 290 may control the display 230 to display a screen 2220including not only the news title but also the news image and the newstext as illustrated in FIG. 22B.

In addition, the controller 290 may control the display 230 to displaydifferent information on the exposure area and the hidden area when thedisplay 230 is folded. In this case, as illustrated in FIG. 23A, thecontroller 290 may control the display 230 to display common informationon an exposure area 2310 and private information on a hidden area 2320.For example, as illustrated in FIG. 23B, the controller 290 may controlthe display 230 to display barcode information which is commoninformation on the exposure area 2330, and credit card list andtransaction information which is private information on the hidden area2340.

Function Change According to Change in Angle where the Display is Folded

According to an exemplary embodiment, while the display 230 is foldedforward such that the first area 320 faces the second area 330 which islarger than the first area 320 with reference to the folding line 310 ofthe display 230, the controller 290 may control the display 230 todisplay the first screen on the exposure area 340 which is an exposedarea of the second area 330. For example, the first screen may includeat least one of an image content, an object, an application, and a text.If the detector 280 detects an unfolding interaction of unfolding thedisplay 230 with reference to the folding line 310 while the firstscreen is displayed, the controller 290 may control the display 230 todisplay the second screen related to the first screen on the first area320 and the second area 330. If the detector 280 detects a foldinginteraction of folding the display 230 backward such that the firstcover 350 corresponding to the first area 320 faces the second cover 370corresponding to the second area 330 with reference to the folding line310, the controller 290 may control the display 230 to display the thirdscreen related to the first screen on the first area 320 or the secondarea 330.

In this case, the state that the first area 320 and the second area 330facing each other means a state where the display 230 is folded forwardsuch that a plane including the first area 320 is in parallel orsubstantially parallel with a plane including the second area 330.Alternatively, the state that the first area 320 and the second area 330facing each other means a state where the display 230 is folded forwardup to a predetermined angle range (for example, 160° to 180°) such thatthe display 230 is unfolded first and then, the first area 320 faces thesecond area 330. The state that first area 320 and the second area 330facing each other may also mean a state where the display 230 is foldedforward such that the first area 320 comes into contact with the secondarea 330.

Similarly, the state that the first cover 350 and the second cover 360facing each other means a state where the display 230 is folded backwardsuch that a plane including the first cover 350 is in parallel orsubstantially parallel with a plane including the second cover 360.Alternatively, the state that the first cover 350 and the second cover360 facing each other means a state where the display 230 is foldedbackward up to a predetermined angle range (for example, 160° to 180°)such that the display 230 is unfolded first and then, the first cover350 faces the second cover 360. The state that first cover 350 and thesecond area 360 facing each other may also mean a state where thedisplay 230 is folded backward such that the first cover 350 comes intocontact with the second cover 360.

Hereinafter, an exemplary embodiment will be described in greater detailwith reference to FIGS. 24 and 25.

FIG. 24 is a view illustrating an exemplary embodiment of performingvarious functions of the user terminal device 200 illustrated in FIG. 2based on a folding interaction.

As illustrated in 2410 of FIG. 24, the controller 290 may control thedisplay 230 to display a first screen 2411 including common information(for example, a mail sender name or a mail-related object) on theexposure area 340 which is an exposed area of the second area 330. Whilethe first screen 2411 is displayed, the detector 280 may detect anunfolding interaction of unfolding the display 230.

If the detector 280 detects an unfolding interaction, as illustrated in2420 of FIG. 24, the controller 290 may control the display 230 todisplay a second screen 2421 with a widget 2421-1 including detailedcommon information (for example, the main text of a mail) on the firstarea 320 and the second area 330. In this case, the second screen 2421may also include other widgets 2421-2, 2421-3. While the second screen2421 is displayed, the detector 280 may detect a folding interaction offolding the display 230 backward such that the cover 350 correspondingto the first area 320 faces the cover 360 corresponding to the secondarea 330 with reference to the folding line 310.

If the detector 280 detects a folding interaction of folding the display230 backward, as illustrated in 2430 of FIG. 24, the controller 290 maycontrol the display 230 to display a third screen 2431 includingdetailed common information (for example, the main text of a mail) onthe second area 330. While the third screen 2431 is displayed, thedetector 280 may detect a flip interaction of flipping the user terminaldevice 200.

If the detector 280 detects a flip interaction, as illustrated in 2440of FIG. 24, the controller 290 may control the display 230 to display afourth screen 2441 including a common information list on the first area320. The common information list may include, for example,identification information regarding a sender who sends a mail, a mailtitle, part of the main text of a mail, and common information regardingthe state of the user terminal device 200. The common information may beaccumulated and displayed in the order where the information isreceived. For example, the common information which is generated mostrecently may be on the top of the common information list.

In another example, in 2420 of FIG. 24, if the detector 280 detects afolding interaction of folding backward, the controller 290 may controlthe display 230 to display the third screen 2431 including the detailedcommon information on the second area 330 and to display the fourthscreen 2441 including the common information list on the first area 320.

FIG. 25 illustrates an exemplary embodiment of performing variousfunctions of the user terminal device 200 illustrated in FIG. 2 based ona folding interaction.

As illustrated in 2510 of FIG. 25, the controller 290 may control thedisplay 230 to display a home screen 2511 including a plurality ofwidgets on the first area 320 and the second area 330. While the homescreen 2511 is displayed, the detector 280 may detect a flap interactionof folding the display 230 forward up to a predetermined angle range(for example, more than 30°) with reference to the folding line 310 andthen, unfolding the display 230 again.

If the detector 280 detects the flap interaction, as illustrated in 2520of FIG. 25, the controller 290 may control the display 230 to display ahome screen 2521 including application icons. While the home screen 2521is displayed, the detector 280 may detect a folding interaction offolding the display 230 backward such that the first cover 350corresponding to the first area 320 faces the second cover 360corresponding to the second area 330 with reference to the folding line310.

If the detector 280 detects the folding interaction, as illustrated in2530 of FIG. 25, the controller 290 may control the display 230 todisplay a folder screen 2531 including a plurality of folders on thesecond area 330. In this case, each of the folders on the folder screen2531 may include application icons which are classified according totheir properties. While the folder screen 2531 is displayed, thedetector 280 may detect a flip interaction of flipping the user terminaldevice 200.

If the detector 280 detects the flip interaction, as illustrated in 2540of FIG. 25, the controller 290 may control the display 230 to display acommon information list screen 2541 including a common information liston the first area 320.

According to another exemplary embodiment, the controller 290 maycontrol the display 230 to display the first screen on the first area320 and the second area 330. While the first screen is displayed, thedetector 280 may detect the first folding interaction of folding thedisplay 230 forward up to a predetermined angle range with reference tothe folding line 310, or the second folding interaction of folding thedisplay 230 backward up to a predetermined angle range.

If the detector 280 detects the first folding interaction, thecontroller 290 may control the display 230 to display the second screenrelated on the first screen on the exposure area 340 which is an exposedarea of the second area 330. On the other hand, if the detector 280detects the second folding interaction, the controller 290 may controlthe display 230 to display the third screen related to the first screenon the first area 320 or the second area 330.

Hereinafter, another exemplary embodiment will be described in greaterdetail with reference to FIG. 26.

FIG. 26 illustrates an exemplary embodiment of performing variousfunctions of the user terminal device 200 illustrated in FIG. 2 based ona folding interaction.

As illustrated in 2610 of FIG. 26, the controller 290 may control thedisplay 230 to display a telephone call request screen 2611 forrequesting a telephone call from outside on the first area 320 and thesecond area 330. While the telephone call request screen 2611 isdisplayed, the detector 280 may detect the first folding interaction offolding the display 230 forward to up to a predetermined angle range, orthe second folding interaction of folding the display 230 backward up toa predetermined angle range. In this case, folding the display 230forward up to a predetermined angle range may be, for example, foldingthe display 230 forward with reference to the folding line 310 such thatthe first area 320 faces the second area 330. In addition, folding thedisplay 230 backward up to a predetermined angle range may be, forexample, folding the display 230 backward at more than 90° withreference to the folding line 310 such that the user terminal device 200can stand on the floor.

If the detector 280 detects the first folding interaction, asillustrated in 2620 of FIG. 26, the controller 290 may control thedisplay 230 to display a telephone call refusal screen 2621 including anobject or a text for refusing the telephone call request. On the otherhand, if the detector 280 detects the second folding interaction, asillustrated in 2630 of FIG. 26, the controller 290 may accept thetelephone call request, execute a speaker phone function, and controlthe display 230 to display a telephone call acceptance screen 2631including icons for controlling various functions of a telephone call.

Hereinafter, various exemplary embodiments wherein a visual effect ofthe user terminal device 200 illustrated in FIG. 2 where an object or animage content changes while the display 230 is folded will be describedwith reference to FIGS. 27 to 29.

FIG. 27 is a view provided to explain an exemplary embodiment ofperforming various functions of the user terminal device 200 illustratedin FIG. 2 based on a folding interaction according to another exemplaryembodiment.

As illustrated in 2710 of FIG. 27, the controller 290 may control thedisplay 230 to display a home screen 2711 including application icons onthe first area 320 and the second area 330. While the home screen 2721is displayed, the detector 280 may detect a folding interaction offolding the display 230 backward with reference to the folding line 310.

If the detector 280 detects the folding interaction, as illustrated in2720 of FIG. 27, the controller 290 may control the display 230 todisplay a visual effect of moving each of the application icons of thehome screen 2711 to a respective folder. Specifically, as the angle atwhich the display 230 is folded increases, the controller 290 maycontrol the display 230 to display a process where the application iconsgradually move upward and enter categorized folders.

If the detector 280 keeps detecting a folding interaction and detects afolding interaction of folding the display 230 such that the cover 350corresponding to the first area 320 faces the cover 360 corresponding tothe second area 330, as illustrated in 2730 of FIG. 27, the controller290 may control the display 230 to display a folder screen 2731 withfolders including application icons on the second area.

FIG. 28 illustrates an exemplary embodiment of performing variousfunctions of the user terminal device 200 illustrated in FIG. 2 based ona folding interaction.

As illustrated in 2810 of FIG. 28, the controller 290 may control thedisplay 230 to display a screen 2811 including common information (forexample, a mail sender name or a mail-related object) on the exposurearea 340 which is an exposed part of the second area 330. While thescreen 2811 is displayed, the detector 280 may detect an unfoldinginteraction of unfolding the display 230.

If the detector 280 detects the unfolding interaction, the controller290 may control the display 230 to display a visual metaphor effect ofspreading a folder according to the angle where the display 230 isunfolded. Specifically, if the angle where the display 230 is unfoldedis within the first angle range (for example, 5°˜90°), as illustrated in2820 of FIG. 28, the controller 290 may control the display 230 todisplay titles of common information of a common information list. Ifthe angle where the display 230 is unfolded is within the second anglerange (for example, 90°˜160°), as illustrated in 2830 of FIG. 28, thecontroller 290 may control the display 230 to display titles and a partof main texts of common information of a common information list. If theangle where the display 230 is unfolded is within the third angle range(for example, 160°˜180°), as illustrated in 2840 of FIG. 28, thecontroller 290 may control the display 230 to display a screen 2841 witha widget including detailed common information.

FIG. 29 illustrates an exemplary embodiment of performing variousfunctions of the user terminal device 200 illustrated in FIG. 2 based ona folding interaction.

As illustrated in 2910 of FIG. 29, the controller 290 may control thedisplay 230 to display a screen 2911 including common information (forexample, an envelope object) on the exposure area 340 which is anexposed part of the second area 330. While the screen 2911 is displayed,the detector 280 may detect an unfolding interaction of unfolding thedisplay 230.

If the detector 280 detects the unfolding interaction, as illustrated in2920 of FIG. 29, the controller 290 may control the display 230 todisplay a visual metaphor effect that a letter appears after the envelopopens. Specifically, as the angle where the display 230 is unfoldedincreases, the controller 290 may control the display 230 to display theprocess that the envelop opens and the main contents of a letter appeargradually.

If the detector 280 detects an unfolding interaction of unfolding thedisplay 230 completely, as illustrated in 2930 of FIG. 29, thecontroller 290 may control the display 230 to display a screen 2931including detailed common information (for example, the main text of amail).

According to another exemplary embodiment, the controller 290 maycontrol the display 230 to display the first screen on the second area330, and to display the second screen related to the first screen on thefirst area 320.

While the first screen and the second screen are displayed, the detector280 may detect a flap interaction of folding the display 230 up to apredetermined angle range (for example, more than 30°) with reference tothe folding line 310 and unfolding the display 230 again. If thedetector 280 detects the flap interaction, the controller 290 maycontrol the display 230 to keep displaying the first screen on thesecond area 330 and to display the third screen related to the firstscreen instead of the second screen on the first area 320.

Hereinafter, another exemplary embodiment will be described in greaterdetail with reference to FIGS. 2 and 30 to 32.

FIG. 30 illustrates an exemplary embodiment of performing variousfunctions of the user terminal device illustrated in FIG. 2 based on afolding interaction.

As illustrated in 3010 of FIG. 30, the controller 290 may control thedisplay 230 to display a message transmission screen 3011 including amessage to be transmitted to a counterpart and a transmission button fortransmitting a message on the second area 330 and to display a keypadscreen 3012 for inputting a text to be displayed on the message displayscreen 3011 on the first area 320. While the keypad screen 3012 isdisplayed, the detector 280 may detect a flap interaction of folding thedisplay 230 forward up to a predetermined angle range (for example, morethan 30°) with reference to the folding line and then, unfolding thedisplay 230 again.

If the detector 280 detects the flap interaction, as illustrated in 3020of FIG. 30, the controller 290 may control the display 230 to displaythe message transmission screen 3011 continuously on the second area330, and to display a clip board screen 3021 including apreviously-copied text or a captured image instead of the keypad screen3012 on the first area 320. While the clip board screen 3021 isdisplayed, the detector 280 may detect a flap interaction of folding thedisplay 230 again with reference to the folding line 310 and unfoldingthe display 230.

If the detector 280 detects the flap interaction, as illustrated in 3030of FIG. 30, the controller 290 may control the display 230 to display agallery screen 3031 including images stored in the user terminal device200 or in an external server instead of the clip board screen 3021.While the gallery screen 3031 is displayed, the detector 280 may detecta user interaction of touching and selecting at least one of the imagesincluded in the gallery screen 3031 and dragging or flipping theselected image in the direction of the second area 330.

If the detector 280 detects the user interaction, as illustrated in 3040of FIG. 30, the controller 290 may control the display 230 to displaythe message transmission screen 3011 including the selected image on thesecond area 330. In this case, if the detector 280 detects a touchinteraction of selecting a transmission button of the messagetransmission screen 3011, the controller 290 may control thecommunicator 240 to transmit a message with an image included in themessage transmission screen 3011 to a counterpart.

Meanwhile, if the detector 280 detects a flap interaction while thegallery screen 3031 is displayed, the controller 290 may control thedisplay 230 to display the keypad screen 3012 again instead of thegallery 3031 on the first area 320.

FIG. 31 illustrates an exemplary embodiment of performing variousfunctions of the user terminal device 200 illustrated in FIG. 2 based ona folding interaction.

As illustrated in 3110 of FIG. 31, the controller 290 may control thedisplay 230 to display a gallery screen 3111 including images on thefirst area 320 and the second area 330. While the gallery screen 3111 isdisplayed, the detector 280 may detect a flap interaction of folding thedisplay 230 again with reference to the folding line 310 and unfoldingthe display 230.

If the detector 280 detects the flap interaction, as illustrated in 3120of FIG. 31, the controller 290 may control the display 230 to displaypart of the gallery screen 3111 on the second area 330 and to display amessage transmission screen 3121 on the first area 320. While themessage transmission screen 3121 is displayed, the detector 280 maydetect a flap interaction of folding the display 230 again withreference to the folding line 310 and unfolding the display 230.

If the detector 280 detects the flap interaction, as illustrated in 3130of FIG. 31, the controller 290 may control the display 230 to display anotice screen 3131 for registering a content in a notice provided by asocial network service (for example, Facebook, Twitter, etc.) instead ofthe message transmission screen 3121. While the notice screen 3131 isdisplayed, the controller 290 may detect a user interaction of touchingat least one of the images included in the gallery screen 3111 anddragging or flipping the selected image in the direction of the firstarea 320.

If the detector 280 detects the user interaction, as illustrated in 3140of FIG. 31, the controller 290 may control the display 230 to displaythe notice screen 3131 including the selected image on the second area330. In this case, if the detector 280 detects a touch interaction ofselecting a notice button on the notice screen 3131, the controller 290may control the communicator 240 to transmit the image included in thenotice screen 3131 to a social network server so that the image can beshared with a third party.

Meanwhile, if the detector 280 detects a flap interaction while thenotice screen 3131 is displayed, the controller 290 may control thedisplay 230 to display the gallery screen 3111 again on the first area320 and the second area 330.

FIGS. 32A to 32D illustrate an exemplary embodiment of performingvarious functions of the user terminal device 200 illustrated in FIG. 2based on a folding interaction.

As illustrated in 3210 of FIG. 32A, the controller 290 may control thedisplay 230 to display a memory list screen 3211 including memos on thefirst area 320 and the second area 330. While the memo list screen 3211is displayed, the detector 280 may detect a flap interaction of foldingthe display 230 with reference to the folding line 310 and unfolding thedisplay 230.

If the detector 280 detects the flap interaction, as illustrated in 3220of FIG. 32A, the controller 290 may control the display 230 to displaypart of the memo list screen 3211 on the first area 320 and to display amemo writing screen 3221 on the second area 330. While the memo writingscreen 3221 is displayed, the controller 290 may detect a userinteraction of tap-touching one area of the memo writing screen 3221.

If the detector 280 detects the user interaction, as illustrated in 3230of FIG. 32B, the controller 290 may control the display 230 to moveupward and display the memo writing screen 3221 on the first area 320,and to display a keypad screen 3231 on the second area 330. While thekeypad screen 3231 is displayed, the detector 280 may detect a userinteraction of panning in one direction on the keypad screen 3231.

If the detector 280 detects the user interaction, as illustrated in 3240of FIG. 32B, the controller 290 may control the display 230 to display agallery screen 3241 including images on the second area 330. While thegallery screen 3241 is displayed, the detector 280 may detect a userinteraction of long-tapping and selecting one of the images included inthe gallery screen 3241.

If the detector 280 detects the user interaction, as illustrated in 3250of FIG. 32C, the controller 290 may control the display 230 to display avisual effect of moving the selected image to the first area 320.

In addition, as illustrated in 3260 of FIG. 32C, the controller 290 maycontrol the display 230 to display the memo writing screen 3221including the selected image on the first area. While the selected imageis included in the memo writing screen 3221, the detector 280 may detecta user interaction tapping a storage button for executing the functionof storing a written memo.

If the detector 280 detects the user interaction, as illustrated in 3270of FIG. 32D, the controller 290 may store the content of the memowriting screen 3221 including images as a memo, and may control thedisplay 230 to display the memo list screen 3211 including the storedmemo on the first area 320. The controller 290 may control the display230 to display a toast pop-up 3271 informing that the memo is stored fora few seconds (for example, 1˜2 seconds).

FIG. 33 illustrates an exemplary embodiment of performing variousfunctions of the user terminal device 200 illustrated in FIG. 2 based ona folding interaction.

As illustrated in FIG. 3310 of FIG. 33, the controller 290 may controlthe display 230 to display a screen 3311 including an image content onthe first area 320 and the second area 330. While the screen 3311 isdisplayed, the detector 280 may detect a first flap interaction offolding the display 230 backward up to a predetermined angle range withreference to the folding line 310 and unfolding the display 230. Inaddition, the detector 280 may detect a second flap interaction offolding the display 230 forward up to a predetermined angle range withreference to the folding line 310 and unfolding the display 230.

If the detector 280 detects the first flap interaction, as illustratedin 3320 of FIG. 33, the controller 290 may control the display 230 todisplay a screen 3321 including a magnified image content on the firstarea 320 and the second area 330. In this case, the controller 290 maychange a magnification ratio of the image content according to the anglewhere the display 230 is folded backward with reference to the foldingline 310. For example, the greater the angle where the display 230 isfolded, the higher the magnification ratio of the image content.

On the other hand, if the detector 280 detects the second flapinteraction, as illustrated in 3330 of FIG. 33, the controller 290 maycontrol the display 230 to display a screen 3331 including a reducedimage content on the first area 320 and the second area 330. In thiscase, the controller 290 may change a reduction ratio of an imagecontent according to the angle where the display 230 is folded forwardwith reference to the folding line 310. For example, the greater theangle where the display 230 is folded, the higher the reduction ratio ofthe image content.

FIG. 34 illustrates an exemplary embodiment of performing variousfunctions of the user terminal device 200 illustrated in FIG. 2 based ona folding interaction.

As illustrated in 3410 of FIG. 34, the controller 290 may control thedisplay 230 to display a screen 3411 including an information list onthe first area 320 and the second area 330. If the information list is,for example, a feed list for sharing information with members of aspecific group through a social network service, the information listmay include at least one of identification information of a counterpartwho registers the information, a text, an image content, and icons.While the screen 3411 is displayed, the detector 280 may detect thefirst flap interaction of folding the display 230 backward up to apredetermined angle range with reference to the folding line 310 andunfolding the display 230. Alternatively, the detector 280 may detectthe second flap interaction of folding the display 230 forward up to apredetermined angle range with reference to the folding line 310 andunfolding the display 230.

If the detector 280 detects the first flap interaction, as illustratedin 3420 of FIG. 34, the controller 290 may control the display 230 tosummarize and display information included in the first area 320 asscreen 3421. Specifically, the controller 290 may control the display230 to display the titles feeds included in the first area 320 as ifthey fall down and accumulated in a gravity direction.

On the other hand, if the detector 280 detects the second flapinteraction after the display 230 is folded forward, as illustrated in3430 of FIG. 34, the controller 290 may control the display 230 tomagnify and display information included in the first area 320 as screen3431. Specifically, the controller 290 may control the display 230 tomagnify cards of the feeds included in the first area 320 so that thecards including more detailed content can be displayed.

FIG. 35 is a flowchart illustrating a displaying method of the userterminal device 200 according to an exemplary embodiment.

Specifically, the user terminal device 200 may display a first screen onthe display 230 which is divided into the first area 320 and the secondarea 330 which is larger than the first area with reference to thefolding line 310 (S3510).

The user terminal device 200 may determine whether a first foldinginteraction of folding the display 230 forward is detected, or a secondfolding interaction of folding the display 230 backward is detected(S3520). In this case, the first folding interaction may be a foldinginteraction of folding the display 230 forward such that the first area320 faces the second area 330 with reference to the folding line 310.The second folding action may be a folding interaction of folding thedisplay backward such that the first cover 350 corresponding to thefirst area 320 faces the second cover 360 corresponding to the secondarea 330 with reference to the folding line 310.

If the first folding interaction is detected, the user terminal device200 may display a second screen related to the first screen on theexposure area 340 which is an exposed part of the second area 330(S3530). On the other hand, if the second folding interaction isdetected, the user terminal device 200 may display a third screenrelated to the first screen on the first area 320 or the second area 330(S3540).

FIG. 36 is a flowchart illustrating a displaying method of the userterminal device 200 according to another exemplary embodiment.

Specifically, the user terminal device 200 may display the first screenon the exposure area 340 which is an exposed part of the second areawhile the display 230 is folded forward such that the first area 320faces the second area 330 with reference to the folding line 310(S3610).

The user terminal device 200 may determine whether an unfoldinginteraction of unfolding the display 230 is detected, or a foldinginteraction of folding the display 230 backward is detected (S3620). Inthis case, the folding interaction may be a folding interaction offolding the display 230 backward such that the first cover 350corresponding to the first area 320 faces the second cover 360corresponding to the second area 330 with reference to the folding line310.

If the unfolding interaction is detected, the user terminal device 200may display the second screen related to the first screen on the firstarea 320 and the second area 330 (S3630). On the other hand, if thefolding interaction is detected, the user terminal device 200 maydisplay the third screen related to the first screen on the first area320 or the second area 330 (S3640).

FIG. 37 is a flowchart illustrating a displaying method of the userterminal device 200 according to another exemplary embodiment.

Specifically, the user terminal device may display the first screen onthe display 230 which is divided into the first area 320 and the secondarea 330 which is larger than the first area 320 with reference to thefolding line (S3710).

The user terminal device 200 may determine whether a first flapinteraction of folding the display 230 forward up to a predeterminedangle range with reference to the folding line 310 and then, unfoldingthe display 230 is detected, or a second flap interaction of folding thedisplay 230 up to a predetermined angle range with reference to thefolding line 310 and then, unfolding the display 230 is detected(S3720).

If the first flap interaction is detected, the user terminal device 200may display the second screen related to the first screen on the secondarea 330 (S3730). On the other hand, if the second flap interaction isdetected, the user terminal device 200 may display the third screenrelated to the first screen on the second area 330 (S3740).

As described above, a UI is displayed on an exposure area which is anexposed area when the display 230 is folded and thus, a user may performvarious functions of a user terminal device through the UI displayed onthe exposure area even if the display is folded and may be provided withvarious information.

A displaying method of a user terminal device according to theabove-described various exemplary embodiments may be realized as aprogram and provided in the user terminal device. Specifically, anon-transitory computer readable medium where a program including amethod for controlling a user terminal device is stored can be provided.

The non-transitory recordable medium refers to a medium which may storedata semi-permanently and may be readable by an apparatus. Specifically,the non-transitory readable medium may be CD, DVD, hard disk, Blu-raydisk, USB, memory card, ROM, etc.

The foregoing exemplary embodiments and advantages are merely exemplaryand are not to be construed as limiting the present invention. Thepresent teaching can be readily applied to other types of apparatuses.Also, the description of exemplary embodiments of the present inventiveconcept is intended to be illustrative, and not to limit the scope ofthe claims, and the disclosure includes many alternatives,modifications, and variations apparent to those skilled in the art.

What is claimed is:
 1. A displaying method of a user terminal devicecomprising a flexible display which is divided by a folding line into afirst area and a second area, the second area being larger than thefirst area and comprising an exposure area that is exposed while theflexible display is folded along the folding line such that the firstarea faces the second area, the method comprising: in response to anincoming telephone call while the flexible display is an unfolded state,displaying a first screen for indicating the telephone call on the firstarea and the second area; detecting at least one of a first foldinginteraction of folding the flexible display from the unfolded state to afirst folded state such that the first area faces the second area and asecond folding interaction of folding the flexible display from theunfolded state to a second folded state such that a first covercorresponding to the first area faces a second cover corresponding tothe second area while the first screen is displayed; and in response todetecting the first folding interaction, displaying a second screen forindicating refusal of the telephone call on the exposure area, and inresponse to detecting the second folding interaction, displaying a thirdscreen for indicating acceptance of the telephone call on one of thefirst area and the second area.
 2. The method as claimed in claim 1,wherein in response to the first screen including information, one ofthe second screen and the third screen is a screen including briefsummary information of the information.
 3. The method as claimed inclaim 1, further comprising: displaying a visual effect of changing anobject or an image content on the flexible display.
 4. A displayingmethod of a user terminal device comprising a flexible display which isdivided by a folding line into a first area and a second area, thesecond area being larger than the first area and comprising an exposurearea that is exposed while the flexible display is folded along thefolding line such that the first area faces the second area, the methodcomprising: in response to an incoming telephone call while the flexibledisplay is in a folded state, displaying a first screen for indicatingthe telephone call on the exposure area; detecting at least one of anunfolding interaction of unfolding the flexible display from the foldedstate to an unfolded state and a folding interaction of folding theflexible display from the unfolded state to the folded state such that afirst cover corresponding to the first area faces a second covercorresponding to the second area; and in response to detecting theunfolding interaction, displaying a second screen indicating acceptanceof the telephone call on the first area and the second area, and inresponse to detecting the folding interaction, displaying a third screenrelated to the first screen on the first area or the second area.
 5. Themethod as claimed in claim 4, wherein in response to the first screenincluding information, one of the second screen and the third screen isa screen including detailed information of the information.
 6. Adisplaying method of a user terminal device comprising a flexibledisplay which is divided by a folding line into a first area and asecond area, the second area being larger than the first area andcomprising an exposure area that is exposed while the flexible displayis folded along the folding line such that the first area faces thesecond area, the method comprising: in response to an incoming telephonecall while the flexible display is unfolded, displaying a first screenfor indicating the telephone call on the first area and the second area;detecting at least one of a first flap interaction of folding theflexible display forward up to a predetermined angle range and thenunfolding the flexible display and a second flap interaction of foldingthe flexible display backward up to a predetermined angle range and thenunfolding the flexible display; and in response to detecting the firstflap interaction, displaying a second screen for indicating refusal ofthe telephone call on the second area, and in response to detecting thesecond flap interaction, displaying a third screen for indicatingacceptance of the telephone call on the second area.
 7. The method asclaimed in claim 6, wherein in response to the first screen includinginformation, one of the second screen and the third screen is a screenincluding brief summary information of the information, and an otherscreen of the second screen and the third screen is a screen includingdetailed information of the information.
 8. A user terminal devicecomprising: a flexible display configured to display, in response to anincoming telephone call while the flexible display is an unfolded state,a first screen for indicating the telephone call on a first area and asecond area, the flexible display being divided by a folding line intothe first area and the second area, the second area being larger thanthe first area and comprising an exposure area that is exposed while theflexible display is folded along the folding line such that the firstarea faces the second area; a detector configured to detect, while thefirst screen is displayed, a first folding interaction of folding theflexible display from the unfolded state to a first folded state suchthat the first area faces the second area and a second foldinginteraction of folding the flexible display from the unfolded state to asecond folded state such that a first cover corresponding to the firstarea faces a second cover corresponding to the second area; and acontroller configured to, in response to detecting the first foldinginteraction, display a second screen for indicating refusal of thetelephone call on the exposure area, and in response to detecting thesecond folding interaction, display a third screen for indicatingacceptance of the telephone call on the first area or the second area.9. The device as claimed in claim 8, wherein in response to the firstscreen including information, one of the second screen and the thirdscreen is a screen including brief summary information of theinformation.
 10. The device as claimed in claim 8, wherein thecontroller controls the flexible display to display a visual effect ofchanging an object or an image content on the flexible display.
 11. Thedevice as claimed in claim 8, wherein the detector is further configuredto detect a touch input at the flexible display, and wherein thecontroller is further configured to determine the second screen based ona touch input detected at the flexible display.
 12. The device asclaimed in claim 11, wherein the controller is further configured todetermine the second screen based on an icon indicated by the touchinput during the first folding interaction.
 13. The device as claimed inclaim 8, wherein the flexible display is a single continuous flexibledisplay.
 14. A user terminal device comprising: a flexible displayconfigured to display, in response to an incoming telephone call whilethe flexible display is in a folded state, a first screen for indicatingthe telephone call on an exposure area, the flexible display beingdivided by a folding line into a first area and a second area, thesecond area being larger than the first area and comprising the exposurearea that is exposed while the flexible display is folded along thefolding line such that the first area faces the second area; a detectorconfigured to detect an unfolding interaction of unfolding the flexibledisplay from the folded state to an unfolded state and a foldinginteraction of folding the flexible display from the unfolded state tothe folded state such that a first cover corresponding to the first areafaces a second cover corresponding to the second area; and a controllerconfigured to, in response to detecting the unfolding interaction,displaying a second screen indicating acceptance of the telephone callon the first area and the second area, and in response to detecting thefolding interaction, displaying a third screen related to the firstscreen on the first area or the second area.
 15. The device as claimedin claim 14, wherein in response to the first screen includinginformation, one of the second screen and the third screen is a screenincluding detailed information of the information.
 16. A user terminaldevice comprising: a flexible display configured to display, in responseto an incoming telephone call while the flexible display is unfolded, afirst screen for indicating the telephone call on a first area and asecond area, the flexible display being divided by a folding line intothe first area and the second area, the second area being larger thanthe first area and comprising an exposure area that is exposed while theflexible display is folded along the folding line such that the firstarea faces the second area, the device comprising; a detector configuredto detect a first flap interaction of folding the flexible displayforward up to a predetermined angle range with reference to the foldingline and then unfolding the flexible display and a second flapinteraction of folding the flexible display backward up to apredetermined angle range and then unfolding the flexible display; and acontroller configured to, in response to detecting the first flapinteraction, display a second screen for indicating refusal of thetelephone call on the second area, and in response to detecting thesecond flap interaction, display a third screen for indicatingacceptance of the telephone call on the second area.
 17. The device asclaimed in claim 16, wherein in response to the first screen includinginformation, one of the second screen and the third screen is a screenincluding brief summary information of the information, and an otherscreen of the second screen and the third screen is a screen includingdetailed information of the information.